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<p><a href="Default.asp">ASP Kitchen</a>: <a href="ClassicASPArticles.asp">Classic ASP Articles</a>:
VBScript Regular Expressions: Subexpression Substitutions</p>
<h1>VBScript Regular Expressions: Subexpression Substitutions</h1>
<h2>Introduction</h2>
<p>Although there are a good range of text handling functions in VBScript, there are times
when the required text replacement operation would be very tricky to carry out with a
combination of calls to functions such as <em>Replace</em>, <em>InStr</em> and <em>Left</em>.
In these cases, it is worth considering the use of VBScript's regular expressions, which
are supported from VBScript version 5 upwards. An <a href="VBScriptRegularExpressions.asp">introduction
to VBScript Regular Expressions</a> is available.</p>
<h2>Complex Substitutions</h2>
<p>A typical use of regular expression substitutions is to process the BBCode tags into
HTML. BBCode is a simplified version of HTML used by web-based applications such as the <a
href="http://www.phpbb.com/" target="_blank">phpBB</a> bulletin board. For example, if the
user wishes to insert a hyperlink in their message then they can either use the BBCode:</p>
<p>[url]http://www.aspalliance.com/[/url] .... which the bulletin board changes to:
<a href="http://www.aspalliance.com/">http://www.aspalliance.com/</a>.</p>
<p>Alternatively, if anchor text is required then this BBCode is used:</p>
<p>[url=http://www.aspalliance.com/]AspAlliance.Com[/url] .... which the bulletin board
changes to: <a href="http://www.aspalliance.com/">AspAlliance.Com</a>.</p>
<h3>Changing [url]http://www.aspalliance.com/[/url] to a Hyperlink</h3>
<p>To change the first BBCode snippet to HTML, the following code can be used:</p>
<p><font color="#000080"><%<br>
InitialString = "</font><font color="#FF0000">[url]http://www.aspalliance.com[/url]</font><font
color="#000080">"<br>
<br>
Set RegularExpressionObject = New RegExp<br>
<br>
With RegularExpressionObject<br>
.Pattern = "</font><font color="#FF0000">\[url\]([^\]]+)\[\/url\]</font><font
color="#000080">"<br>
.IgnoreCase = True<br>
.Global = True<br>
End With<br>
<br>
ReplacedString = RegularExpressionObject.Replace(InitialString, "</font><font
color="#FF0000"><a href=""$1"">$1</a></font><font
color="#000080">")<br>
<br>
Response.Write "</font><font color="#FF0000">Replaced</font><font color="#000080">
" & InitialString & " </font><font color="#FF0000">with:</font><font
color="#000080"> " & ReplacedString<br>
%></font></p>
<p>The text replacement is achieved using the <strong>Replace</strong> method of a <strong>RegExp</strong>
object. The method takes two arguments:
<ul>
<li>The first argument is the string to be searched.</li>
<li>The second argument is the replacement to be made.</li>
</ul>
<p>The regular expression specified by setting the <strong>Pattern</strong> property of
the RegExp object is \[url\]([^\]]+)\[\/url\], which matches the following pattern:
<ul>
<li>\[ = Matches an opening square bracket.</li>
<li>url = Matches the text <em>url</em>.</li>
<li>\] = Matches a closing square bracket.</li>
<li>([^\]]+) = Match one or more of any character except for the character enclosed in
square brackets, which in this instance is a closing square bracket. This part of the
pattern (which matches the URL between the BBCode [url] ... [/url] tags) is enclosed in
parenthesis because it needs to be remembered for the substitution.</li>
<li>\[\/url\] = Matches the closing BBCode url tag.</li>
</ul>
<p>Note that because square brackets ([ ]) and forward slashes (/) have special meanings
in regular expressions, they have to be "escaped" by prefixing them with a
backward slash (\).</p>
<p>In this example, the URL specified between the BBCode [url] ... [/url] tags is
"remembered" because it is within a set of parenthesis. As a result, it can be
used in the replacement by using a dollar sign immediately followed by the number of the
subpattern in the regular expression. There can be more than one set of parenthesis in a
regular expression pattern. This makes it possible to reorder text in substitutions - see
the next section for more details of this.</p>
<h3>Changing [url]http://www.aspalliance.com/[/url] to a Hyperlink</h3>
<p>To change [url=http://www.aspalliance.com/]AspAlliance.Com[/url] to a hyperlink with <a
href="http://www.aspalliance.com/">http://www.aspalliance.com/</a> as the URL and AspAlliance.Com as the
anchor text (i.e. the HTML equivalent of <strong><a
href="http://www.aspalliance.com/">AspAlliance.Com</a></strong>) a more complex
regular expression subsitution may be used:</p>
<p><font color="#000080"><%<br>
InitialString = "</font><font color="#FF0000">[url=http://www.aspalliance.com/]AspAlliance.Com[/url]</font><font
color="#000080">"<br>
<br>
Set RegularExpressionObject = New RegExp<br>
<br>
With RegularExpressionObject<br>
.Pattern = "</font><font color="#FF0000">\[url=([^\]]+)\]([^\]]+)\[\/url\]</font><font
color="#000080">"<br>
.IgnoreCase = True<br>
.Global = True<br>
End With<br>
<br>
ReplacedString = RegularExpressionObject.Replace(InitialString, "</font><font
color="#FF0000"><a href=""$1"">$2</a></font><font
color="#000080">")<br>
<br>
<br>
Response.Write "</font><font color="#FF0000">Replaced</font><font color="#000080">
" & InitialString & "</font><font color="#FF0000"> with: </font><font
color="#000080">" & ReplacedString<br>
<br>
Set RegularExpressionObject = nothing<br>
%></font></p>
<p>In this example, there are two sets of parenthesis which match the subpattern of the
URL (i.e. <a href="http://www.aspalliance.com">http://www.aspalliance.com</a>) and the anchor text
(i.e. AspAlliance.Com). These are accessible in the RegExp object's Replace method as $1 and
$2, respectively.</p>
<p>As mentioned previously, these patterns may be used in a different order to the way
they were matched. They can also be used more than once. For example, this line adds
additional HTML to include a <strong>title</strong> attribute for the <strong>a</strong>
tag:</p>
<p><font color="#000080">ReplacedString = RegularExpressionObject.Replace(InitialString,
"</font><font color="#FF0000"><a href=""$1""
title=""Visit $2 ($1)"">$2</a></font><font color="#000080">")</font></p>
<p>This replacement produces the HTML:</p>
<p><strong><a href="http://www.aspalliance.com/" title="Visit AspAlliance.Com
(http://www.aspalliance.com/)">AspAlliance.Com</a></strong></p>
<!--end article-->
<h2>Useful Development Tools</h2>
<div align="left">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.ASPDocumentationTool.asp" target="_blank" title="ASP Documentation Tool™"><strong>ASP
Documentation Tool™</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Automatically creates developer documentation for ASP 2.0
and 3.0 web applications written in VBScript and JScript. Documentation for Microsoft
Access, SQL Server 7/2000 databases and Visual Basic 6.0 components associated with the
web application can also be incorporated into the reports. Documentation is created in
HTML, HTML Help and plain text formats.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/SampleWeb.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/SampleWeb.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
<a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/Default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASPDocumentationTool_Evaluation_Version.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASPDocumentationTool_Evaluation_Version.zip" title="Download Trial Version">Download
Trial Version</a> (5.2Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.asp" target="_blank" title="Index Server Companion"><strong>Index Server Companion</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">
The Index Server Companion is a Windows application that extends the functionality of Microsoft Index Server so that it is able to index content from remote websites and also from ODBC databases. As such it can be used as a low cost alternative to Site Server 3.0 Search.
</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanionDocumentation.zip"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Product Documentation"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanionDocumentation.zip" title="View Product Documentation">View Product
Documentation</a> (119K ZIP file).<br>
<a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.SampleSearch.asp"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="Try Sample Search Facility"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.SampleSearch.asp"
target="_blank" title="View Sample Search Facility">Try Sample Search Facility</a>.<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanion_EvaluationVersion.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanion_EvaluationVersion.zip" title="Download Trial Version">Download
Trial Version</a> (1.7Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.ASPNETDocumentationTool.asp" target="_blank" title="ASP.NET Documentation Tool"><strong>ASP.NET Documentation Tool</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Automatically creates developer documentation for ASP.NET web applications written in C# or VB.NET.
Documentation for SQL Server 7/2000 databases and C#/VB.NET components associated with the
web application can also be incorporated into the reports. Documentation is created in
HTML, HTML Help and plain text formats.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/SampleWeb.NET.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/SampleWeb.NET.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
<a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/Default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASP.NETDocumentationTool_1.0.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASP.NETDocumentationTool_1.0.zip" title="Download Trial Version">Download
Trial Version</a> (727K ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.SQLDocumentationTool.asp" target="_blank" title="SQL Documentation Tool"><strong>SQL
Documentation Tool</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">The SQL Documentation Tool creates technical documentation for Microsoft SQL Server 7.0 and 2000 databases. Technical documentation is created in HTML and HTML Help formats. The HTML Help format documentation is fully searchable and cross referenced. The SQL Documentation Tool documents SQL Server Tables, Views, Stored Procedures, Triggers and Table Relationships.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Test_Project.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Test_Project.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
<a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/SQLDocumentationToolTrial.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/SQLDocumentationToolTrial.zip" title="Download Trial Version">Download
Trial Version</a> (10.3Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.asp" target="_blank" title="The Website Utility"><strong>The Website Utility</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">The Website Utility examines websites for errors and
areas that need to be optimised for search engines by using a built in web crawling engine.
Errors checked for include broken or moved hyperlinks, missing page titles and missing meta tags.
It also generates HTML for use in creating website site maps (table of contents pages - like <a href="TableOfContents.asp" title="Example Table of Contents">this one</a>), and is
able to create both client-side <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.JavaScriptSearchEngine.asp" title="JavaScript Search Engine">JavaScript Search Engines</a> and server-side <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.ASPSearchEngine.asp" title="JavaScript Search Engine">ASP Search Engines</a> for a website.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/TheWebsiteUtility/Reports/ASPAlliance/default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/TheWebsiteUtility/Reports/ASPAlliance/default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/TheWebsiteUtilityTrial.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/TheWebsiteUtilityTrial.zip" title="Download Trial Version">Download
Trial Version</a> (3Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.regnow.com/softsell/nph-softsell.cgi?item=8452-18&affiliate=44172" target="_blank" title="Text Workbench"><strong>Text Workbench</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Text Workbench is a file search and replacement utility for text files and Microsoft Office documents. Make rapid file replacements on multiple files and folders full of files. Advanced replacement options include regular expressions support. It even works on remote file systems via FTP. A Regular Expression Laboratory allows advanced pattern matching and replacement expressions to be built and tested. This great utility will make your everyday development tasks much easier!
</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.regnow.com/trialware/download/Download_TxtWrBSetup.exe?item=8452-18&affiliate=44172"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version of Text Workbench"
border="0" align="absmiddle"></a> <a
href="http://www.regnow.com/trialware/download/Download_TxtWrBSetup.exe?item=8452-18&affiliate=44172" title="Download Trial Version of Text Workbench">Download
Trial Version</a> (3Mb ZIP file; you have the option to either install directly from this link or save the file for later installation).</td>
</tr>
</table>
</div>
<h2>Author details</h2>
<p><p><a href="http://www.brettb.com/" title="View Brett's personal website">Brett Burridge</a>
spent two years working in the <a href="http://www.essex.ac.uk/"
title="University of Essex">University of Essex</a> Computing Service, before moving to <a
href="http://www.intapps.com/" title="The Internet Applications Group">The Internet
Applications Group</a> in the Autumn of 1999, where he developed e-Business applications for a range of
corporate clients and dot-com start ups.</P>
<P>Brett is presently employed as an Internet developer and technical writer
through his own company,
<a href="http://www.winnershtriangle.com/w/Default.asp" title="Winnersh Triangle Web Solutions Limited" target="_blank">Winnersh Triangle Web Solutions Limited</a>.
The company produces a number of
innovative products, including the popular
<a href="http://www.winnershtriangle.com/w/Products.ASPDocumentationTool.asp" target="_blank" title="ASP Documentation Tool™ - creates project documentation for ASP 2.0 and 3.0 websites written in VBScript and JScript, and also SQL Server 2000 databases">ASP Documentation Tool™</a>, the <a href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.asp" target="_blank" title="Index Server Companion - extends the functionality of Index Server to allow indexing of content from remote websites and ODBC databases">Index Server Companion</a>, the <a href="http://www.winnershtriangle.com/w/Products.ASPNETDocumentationTool.asp" target="_blank" title="ASP.NET Documentation Tool - creates documentation for ASP.NET web applications written in VB.NET and C#">ASP.NET Documentation Tool</a>, the <a href="http://www.winnershtriangle.com/w/Products.SQLServerDocumentationTool.asp" target="_blank" title="SQL Server Documentation Tool - Documents Microsoft SQL Server Databases">SQL Server Documentation Tool</a> and <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.asp" target="_blank" title="The Website Utility">The Website Utility</a>.
The company is also available for <a href="http://www.winnershtriangle.com/w/Services.Main.asp" target="_blank" title="web application design and development">web application design and development</a> at reasonable rates, primarily using
<a href="http://www.winnershtriangle.com/w/Services.Microsoft.asp" target="_blank" title="Development using Microsoft technologies such as ASP, ASP.NET, Visual Basic, SQL Server">Microsoft technologies</a> (ASP, ASP.NET, Visual Basic, SQL Server) but also using <a href="http://www.winnershtriangle.com/w/Services.OpenSource.asp" target="_blank" title="Open source development using technologies such as PHP, MySQL and Perl">open source</a>
technologies such as PHP, MySQL and Perl. Specialist services include development
of <a href="http://www.winnershtriangle.com/w/Services.IndexServer.asp" target="_blank" title="Development of search solutions using Microsoft's Index Server and Site Server 3.0 Search">search solutions</a> using Microsoft's Index Server and Site Server 3.0 Search.
</P>
<P>
As well as the ASPAlliance, Brett has written articles for <a href="http://www.ariadne.ac.uk/issue33/nt-explorer/" title="Read Brett's most recent article for Ariadne.ac.uk" target="_blank">Ariadne.ac.uk</a>
and <a href="http://www.asptoday.com/content.asp?id=1435" target="_blank" title="Read Brett's first ASPToday article">ASPToday</a>, and has contributed recipes to the <a href="http://www.amazon.com/exec/obidos/ASIN/0672325241/brettbcom" target="_blank" title="ASP.NET Developer's Cookbook">ASP.NET Developer's Cookbook</a>.
<small><a href="Links.asp" style="color: rgb(252,253,253);">links</a></small>
</P>
<p>
Outside web development, Brett is interested in digital photography (here's my <a href="http://www.brettb.com/gallery.asp" target="_blank" title="My digital photo gallery">photo gallery</a>), <a href="http://www.brettb.com/MyTropicalFishtank.asp" target="_blank" title="My Tropical Fish!">tropical fishkeeping</a>
and collecting contemporary works of art by artists such as <a href="http://www.brettb.com/Doug_Hyde_Gallery.asp" title="My Doug Hyde Limited Edition Sculptures and Prints" target="_blank">Doug Hyde</a>.
</p>
<p>Contact Brett by emailing <script language="JavaScript"><!--
document.write('<a title="Email Brett" href="mailto:' + 'brett' + '@asp' + 'alliance.com">brett' + '@' + 'aspalliance.com</a>');
// --></script></p>
<p align="center">
<a href="http://www.winnershtriangle.com/w/Default.asp?FROM=http://authors.aspalliance.com/brettb/SubstitutionsInVBScriptRegularExpressions.asp" target="_blank"><IMG SRC="images/WinnershTriangleWebSolutions_BannerAd2.png" width="468" height="60" alt="Winnersh Triangle Web Solutions - Quality web development at affordable prices" border="0"></a>
</p>
</p>
<h2>Article history</h2>
<p>"VBScript Regular Expressions: Subexpression Substitutions" published on ASPAlliance.com on 28 October 2004.</p>
<p><a href="Default.asp">ASP Kitchen</a>: <a href="ClassicASPArticles.asp">Classic ASP Articles</a>:
VBScript Regular Expressions: Subexpression Substitutions</p>
</td>
</td>
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<tr><td bgcolor="#CC0000" colspan="2" style="BORDER-TOP: rgb(102,102,102) 1px solid;"><small><font color="white">© page content copyright Brett Burridge 1998 - 2004.</font></small></td></tr>
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